单项选择题
( )是细菌的运动器官
A、细胞壁
B、荚膜
C、芽胞
D、鞭毛
( )是细菌的运动器官
A、细胞壁
B、荚膜
C、芽胞
D、鞭毛
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单项选择题
Besides a lack of visual effects, what is mentioned as another weakness of radio ads
Besides a lack of visual effects, what is mentioned as another weakness of radio ads
A.Radio advertising time is limited
B.The audience is limited
C.Radio ads are too expensive